The CAS Registry Mumber 12705-28-1 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 1,2,7,0 and 5 respectively; the second part has 2 digits, 2 and 8 respectively. Calculate Digit Verification of CAS Registry Number 12705-28: (7*1)+(6*2)+(5*7)+(4*0)+(3*5)+(2*2)+(1*8)=81 81 % 10 = 1 So 12705-28-1 is a valid CAS Registry Number.
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